Mark Okawachi, PA-C
Surgical Physician Assistant · Walnut Creek, CA
Mark Okawachi, PA-C is a surgical physician assistant with a practice address in Walnut Creek, California, and NPI 1114078631, issued on Jan 12, 2007. Check the license (California C16009, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mark Okawachi
- Credential
- PA-C
- Primary taxonomy
- Surgical Physician Assistant 363AS0400X
- License number
- C16009 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1425 S Main St, Walnut Creek, CA 94596
- Phone
- (925) 295-4130
- Enumerated
- Jan 12, 2007
- Record last updated
- Feb 11, 2022
- Entity
- Type 1 · individual
8 nearest surgical physician assistant records → All 1,075 in California → Look up another NPI →
Also registered at 1425 S Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Eric AaserudeEmergency Medicine Physician1811491194
- Derek Abbassi, MDObstetrics & Gynecology Physician1841364155
- Peter Ackerman, MDEmergency Medicine Physician1427435023
- Aaron Mark Acosta, DOEmergency Medicine Physician1538789987
- Basil Adad, MDOtolaryngology Physician1487732574
- Derek Ailes, M.D.Emergency Medical Services (Emergency Medicine) Physician1992001804
Verify Mark Okawachi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license C16009Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% more Medicare Part D claims than the average surgical physician assistant in 2024
564 Medicare Part D claims for 205 beneficiaries, against an average of 304 among the 10,174 providers of this specialty who prescribed in Part D. Brand-name drugs were 4% of claims. 221 claims were for opioids.
Most prescribed
- Oxycodone Hcl193 claims
- Ondansetron Odt133 claims
- Omeprazole92 claims
- Gabapentin31 claims
- Enoxaparin Sodium28 claims
- Hydrocodone-Acetaminophen20 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Mark Okawachi among 1,075 surgical physician assistant records in California
Mark Okawachi, PA-C is one of 1,075 surgical physician assistant records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 26% of them.
- NPI issued2007 · 26% of these records are older, 59% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2022 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363AS0400X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Surgical Physician Assistant providers in California
There are 1,075 surgical physician assistant records in California.
All 1,075 in California → Every provider in Walnut Creek → Surgical Physician Assistant nationwide →
The 8 surgical physician assistant records with the nearest ZIP codes
- Kennard Beard, P.A.Walnut Creek, CA 945961588960694
- Michele Brocato, PA-CWalnut Creek, CA 945961548330285
- Claire Kerney, PA-CWalnut Creek, CA 945961992936868
- Shannon Rathbun, PA-CWalnut Creek, CA 945961780733691
- David Roberts, P.A.Walnut Creek, CA 945961205991700
- Brian Costello, PHYSICIAN ASSISTANTWalnut Creek, CA 945981396833257
- Patricia Loo, P.A.Walnut Creek, CA 945981083755862
- Thomas Markiewith, P.A.Walnut Creek, CA 945981427086149
Common questions
What is Mark Okawachi, PA-C's NPI number?
Mark Okawachi, PA-C's National Provider Identifier (NPI) is 1114078631, issued on Jan 12, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Mark Okawachi, PA-C located?
The NPPES record lists a practice address at 1425 S Main St, Walnut Creek, CA, 94596. Phone: (925) 295-4130. Providers update this record themselves, so call before visiting.
How can I verify Mark Okawachi, PA-C's license?
NPPES lists California license number C16009, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Mark Okawachi, PA-C prescribe under Medicare Part D?
In 2024, Mark Okawachi, PA-C had 564 Medicare Part D claims for 205 beneficiaries; the average among surgical physician assistant prescribers was 304. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.